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분야
ppt2. Structure
3. Property
4. Ceramic PTC vs Polymer PTC
5. Manufacturing Method
6. Application
써미스터란 Thermally Sensitive Resistor의 약자로서 온도 변화에 대하여 큰 저항값변화를 나타내는 저항기로써 PTC써미스터는 온도의 상승과 함께 저항이 증가하는 특성을 나타내며, BaTiO계 세라믹스를 이용한 세라믹 PTC와 폴리머 PTC로 구분되어진다.
2. Structure
BaTiO3의 Perovskite Structure
입체적 Perovskite Structure
Curie Point(약393K)를 기준으로 한 구조의 변화
3. Property
기본적인 특성
3-1. 저항-온도 특성
PTC써미스터의 주위 온도를 바꾸면서 줄(joul)열로써 자기 발열을 반한정도의 미소전압(통상DC1.5V 이하)으로 전기저항을 측정하여 [그림1] 과 같은 저항-온도 특성을얻게된다. 저항치가 급하게 증가하는 온도를 큐리온도(TC)라 하고 미소 저항치(Rmin)의 2배의 저항치에 대응한 온도를 정의한다.
